NESbox allows players to add ROMs to a USB stick and then play them through its emulation software. This seemingly violates Nintendo's copyright and is pretty darned illegal, but it can be done.

The app's website describes NESbox as "a virtual console where you can make and play retro games", adding: "There are built-in tools for development: code, sprites, maps, sound editors and the command line, which is enough to create a mini retro game."

NESbox is currently available to download on Windows phones and PC, a platform where violation of copyright is less hard to manage, but transition to the Xbox One is a big deal.

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We can't help but feel that the certification is an oversight that will be quickly corrected in order to avoid a lawsuit.

If you're looking for a perfectly legitimate way to play NES games, then the NES Classic is probably the best way to go. Nintendo's new edition of the beloved hardware comes with 30 built-in games, and is a lot less morally dubious.